<h2>题目编号 : 178</h2>
<div style="color:#666;font-size:80%;">19 January 2008</div><br />
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Consider the number 45656. <br />
It can be seen that each pair of consecutive digits of 45656 has a difference of one.<br />
A number for which every pair of consecutive digits has a difference of one is called a step number.<br />
A pandigital number  contains every decimal digit from 0 to 9 at least once.<br />

How many pandigital step numbers less than 10<img src="" style="display:none;" alt="^(" /><sup>40</sup><img src="" style="display:none;" alt=")" /> are there?

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